Sex shops: seedy, if not downright sinister; XXX signs plastered on blacked-out windows in shady neighborhoods; frequented mainly by men. When it comes to the flesh industry, Europe, for all its sophistication, wasn't much different from the U.S. Then along came Ann Summers, a British chain of sex emporiums, and things began to change. The 23 Ann Summers stores scattered across Britain are on main shopping streets and geared specifically to women. Brightly lighted and decorated in pastels, the shops manage to make the selling of erotic lingerie and sex aids seem more naughty than nasty. And 70% of Ann Summers'...